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One question could be: Why is the humming different for analog ? My hunch is it's the receiver's analog inputs, it's being noise-filtered or so, but apperently it does not do the same for HDMI. Perhaps an oversight in the DENON manufacturer's design, believing HDMI does not transmit noise, just speculation though, it could also be the Creative X-Fi Elite Pro 7.1 soundblaster filtering out these signals before transmission over analog cables.

Bye,
Skybuck.

I've never much heard of HDMI having cable noise, it being a digital connection, but I do understand that coil whine can be present in a variety of system configurations. And generally it always comes to the video cards as they tend to be the highest power hog on that system itself. The configurations in and around that video card are a different stories. Sometimes it just exists due to that card's build and the type of transformers and conductors the use